I mean, he just means that he doesn't follow the word of god right? and keep in mind, I have no problem with people believing in god but the bible can be used as an excuse for a lot of bad things. And a lot of people do use it for an excuse to do bad things, and when they use it that way I'm going to have an issue as a person with very extremist views.
for example, if one follows satan, against the words of god, they would be disagreeing with things like 1 Timothy 2:12 which is reasonable because it is a very sexist entry and should be disagreed with.